Linear light emitting diode (LED) lighting fixture

Abstract

A light emitting diode (LED) lighting fixture having an elongated casing, an array of LEDs mounted on a printed circuit board and a holographic film element providing a near lossless optical element for redistributing the light emission patterns from adjacent ones of the LEDs into an array light emission pattern wherein the emitted light in a region of the array light emission pattern is comprised of a sum of overlapping light emission patterns of a plurality of the LEDs. The casing is divided into a lighting element compartment containing the LED printed circuit board and holographic film element and a power supply compartment containing at least one power supply, each being thermally isolated from the other.

What is claimed is: 
     
       1. A light emitting diode (LED) light fixture comprising:
 an elongated unitary casing, the elongated casing comprises parallel spaced apart first and second casing walls which are interconnected with one another by a partition wall which divides the casing into a lighting element compartment and a power supply compartment, the lighting element compartment and the power supply compartment are mutually thermally isolated from one another by the partition wall; 
 an array of LEDs mounted on a printed circuit board which is mounted within the lighting element compartment of the casing, wherein each LED of the LED array has a light emission pattern which includes a generally narrow conical emitted light distribution; 
 a holographic film element being mounted within the lighting element compartment of the casing, the holographic film element comprises a holographic pattern for redistributing the light emission patterns from adjacent ones of the LEDs into an array light emission pattern, and the emitted light in a region of the array light emission pattern comprises a sum of overlapping light emission patterns of a plurality of the LEDs; and 
 at least one power supply is mounted to a power supply support which is mounted within the power supply compartment of the casing, the power supply compartment is enclosed and sealed to protect the power supply from the elements. 
 
     
     
       2. The light emitting diode (LED) light fixture according to  claim 1 , wherein the light emitting diode (LED) light fixture further comprises a covering element with at least one transparent section, and the at least one transparent section is arranged so that light emitted from the LED array which passes through the holographic film exits the light emitting diode (LED) light fixture by passing through the at least one transparent section. 
     
     
       3. The light emitting diode (LED) light fixture according to  claim 2 , wherein at least a portion of the at least one transparent section has a magnification equal to one. 
     
     
       4. The light emitting diode (LED) light fixture according to  claim 2 , wherein at least a portion of the at least one transparent section has a magnification value greater than one. 
     
     
       5. The light emitting diode (LED) light fixture according to  claim 2 , wherein at least a portion of the at least one transparent section has a magnification value less than one. 
     
     
       6. The light emitting diode (LED) light fixture according to  claim 1 , wherein the power supply support is slidably mounted within an interior of the power supply compartment via a pair of rails so as to facilitate sliding removal thereof via an end of the light emitting diode (LED) light fixture. 
     
     
       7. The light emitting diode (LED) light fixture according to  claim 6 , wherein the power supply support extends generally normal to and is located between the first and the second casing walls. 
     
     
       8. The light emitting diode (LED) light fixture according to  claim 6 , wherein the power supply support is located between the first and the second casing walls, extends generally parallel to the first and the second casing walls but is supported by only one of the first and the second casing walls. 
     
     
       9. The light emitting diode (LED) light fixture according to  claim 1 , wherein the power supply support supports a plurality of sequentially arranged power supplies within the power supply compartment of the casing. 
     
     
       10. The light emitting diode (LED) light fixture according to  claim 1 , wherein a single power supply supplies electrical power a plurality of LED arrays coupled in parallel with one another.